/**
*      author: Y_Yao
*      created: 2025-01-25 20:01:07
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 1e18;
const int INF = 0x3f3f3f3f;
int a[6];

void solve()
{
    for(int i = 1;i <= 5;i++)
    {
        cin >> a[i];
    }

    int flag = 0;
    for(int i = 1;i <= 5;i++)
    {
        if(i + 1 <= 5 && a[i] > a[i + 1])
        {
            if(flag == 1)
            {
                cout << "No" << endl;
                return;
            }
            swap(a[i],a[i+1]);
            flag = 1;
        }
    }
    if(flag == 0)
    {
        cout << "No" << endl;
        return;
    }
    cout << "Yes" << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}